I never had a hump. I bought my kit, and a bottle of Dekang USA mix (YUCK!). Googled "electronic cigarette," found ECF, bought a different juice (Dragon's Blood from ECBlend), and loved it so much I was craving it instead of cigarettes. Went from 1 and 1/2 packs a day to zero in one week.
However, I think the biggest problem for most people is finding a juice they like immediately, and can stick with. That is the biggest complaint I here from people I have converted. I was lucky I guess. I still vape Dragon's Blood on occasion, and while it is still a great juice, it never compares to the first time I vaped it.